Filter

ABSTRACT

A filter including a cylindrical filter element which is arranged to normally have fluid pass therethrough. A bypass valve is provided to bypass fluid directly to the outlet when the pressure at the inlet becomes excessive. A magnetized helical coil is provided adjacent the filter element to attract metal particles.

United States Patent Inventors Ronald A. Aspinwall Detroit; MacKellar K.Graham, Birmingham, both 01, Mich. Appl. No. 855,693 Filed Sept. 5, 1969Patented Aug. 10, 1971 Assignee Sperry Rand Corporation Troy, Mich.

FILTER 8 Claims, 5 Drawing Figs.

US. Cl. 210/130, 210/223 Int. Cl 801d 27/10 Field of Search 210/42,

[56] References Cited UNITED STATES PATENTS 2,690,842 10/1954 Spluvak210/222 X 3,313,416 4/1967 Rosaen..... 21/223 X 3,371,790 3/1968 Kudlaty210/223 Primary ExaminerSamih N. Zaharna AnomeyBarnes, Kisselle, Raisch& Choate ABSTRACT: A filter including a cylindrical filter element whichis arranged to normally have fluid pass therethrough. A bypass valve isprovided to bypass fluid directly to the outlet when the pressure at theinlet becomes excessive. A magnetized helical coil is provided adjacentthe filter element to attract metal particles.

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INVENTOR. RONALD A. ASPINWALL g1 l5-(.lKELLAI'i' K. GRAHAM ATTORNEYSFILTER BACKGROUND or THE INVENTION In fluid filters that are utilizedfor filtering hydraulic fluids 5 and the like, it is desirable toprovide some means to attract metal particles and remove them from thehydraulic system.

Among the objects of the invention are to provide a filter having anovel means for removing metal particles from the fluid and to provide anovel method of forming the same.

SUMMARY OF THE INVENTION A filter including a cylindrical filter elementwhich is arranged to normally have fluid pass therethrough. A linearbypass valve is provided to bypass fluid directly to the outlet when thepressure at the inlet becomes excessive. A magnetized coil is providedadjacent the filter element to attract metal particles.

DESCRIPTION OF THE DRAWINGS.

DESCRIPTION Referring to FIG. 1, a filter embodying the inventioncomprises a generally cylindrical housing having a radial inlet 11 andan axial outlet 12. The housing includes a removable cover 13 thatcloses one end thereof opposite the axial outlet 12.

A cylindrical filter element 14 is positioned within the housing and hasone end thereof sealingly engaging an axial projection 15 with an O-ring16 forming the seal.

The other end of the filter element 14 is identical in construction andforms a seal with an axial projection 17 on the cover with an O-ring 18again forming the actual seal.

The projection 17 includes an opening 19 in which a bypass valve 20 ispositioned. The bypass valve 20 is yieldingly urged outwardly andupwardly as viewed in F IG. 1 by a helical spring 2] that is interposedbetween the valve 20 and the other end of the filter element, the springserving the additional function of maintaining the filter elementagainst the shoulder 22 of the filter. Axial projection 17 includesradial openings 23 that provide fluid communication between the inlet 11and the other end of the bypass valve 20.

When the filter 14 becomes dirty, the bypass valve 20 will move axiallyinwardly and eventually open permitting fluid to be bypassed directly tothe outlet 12. Indicating means 25 are provided on the cover 13 toindicate the fact that the filter is dirty and that the bypass valve hasmoved. Specifically, indicating means forms no part of the presentinvention A spring surrounds the filter element and is interposedbetween the cover and the housing. As shown diagrammatically in FIG. 2,the spring 30 is magnetized in successive north-south poles along itslength in order to collect ferrous metal particles in the fluid whichmight tend to pass through the filter.

The spring 30 is preferably made of a readily magnetizable material suchas Cunife l which has a composition of 60 percent copper, 20 percentnickel and 20 percent iron. This material is ductile and can be coldworked to form the spring. In addition it can be readily permanentlymagnetized so that the resultant magnetized spring has strong magneticproperties.

Although the spring 30 has been shown in helical form, the wire materialcan be formed in undulating form comprising generally vertical legsconnected by loops to produce a onepiece generally cylindrical elementwhich surrounds the filter element.

In addition, the spring 21 is also preferably magnetized and functionsto collect ferrous particles when the bypass valve has moved to permitfluid to be bypassed.

In accordance with the invention, spring 30 is magnetized utilizing theapparatus shown in FIGS. 3 and 4. The spring is placed on a core 36interposed between jaws 31a, 31b and the jaws are caused to clamp thespring. Jaws 31a, 31b contact spaced peripheral portions of the spring.Each jaw 31 forms one pole of a magnetic coil 33 that is energized froma DC power supply 34. The jaw or pole piece 31b is movable by a screw 35to accommodate insertion and removal of the spring. When in position formagnetization, the coil rests on a plate 37 of nonmagnetic material.

In the form of the invention shown in FIG. 5, jaws 31 have a pluralityof spaced contact portions such that a greater number of north-southpoles are provided along the length of the spring 30.

The apparatus shown can also be utilized for magnetizing other forms ofmagnetic element such as the sinuous type described above.

We claim:

1. A filter comprising a housing,

a filter element in said housing,

said housing having an inlet extending to one side of said filterelement and an outlet extending to the other side of said filterelement,

means on said housing closing one end of said filter element,

and a movable bypass valve closing the other end of said filter element,

means communicating between the inlet side of said housing and saidvalve to cause movement of said valve when the pressure exceeds apredetermined value,

and a magnetized wire element surrounding said filter element in spacedrelation thereto,

said wire element comprising a helical coil spring,

said helical coil spring being magnetized in alternating north and southpoles along its length, i

said filter including a spring urging said bypass valve to a closedposition,

said last-mentioned spring being magnetized in alternating north andsouth poles along its length.

2. A filter comprising a housing,

a filter element in said housing,

said housing having an inlet extending to one side of said filterelement and an outlet extending to the other side of said filterelement,

means on said housing closing one end of said filter element,

and bypass valve means closing the other end of said filter element,

means communicating between the inlet side of said housing and saidvalve means to cause relative movement of said valve and said filterwhen the pressure exceeds a predetermined value,

and a sinuous magnetized wire element interposed between opposedportions of said housing and surrounding said filter element in spacedrelation thereto,

said sinuous magnetized wire element being magnetized in alternatingnorth and south poles along its length.

3. The combination set forth in claim 2 wherein said wire elementcomprises a helical coil spring.

4. The combination set forth in claim 2 wherein said filter includes aspring urging said bypass valve means to a closed position,

said last-mentioned spring being magnetized in alternating north andsouth poles along its length.

5. The combination set forth in claim 2 wherein said magnetizing wireelement comprises a strongly magnetic material.

6. The combination set forth in claim 5 wherein said material comprisesCunife I.

and bypass valve means closing the other end of said filter element,

means communicating between the inlet side of said housing and saidvalve means to cause relative movement of said valve and said filterwhen the pressure exceeds a predetermined value,

and a helical magnetized wire element surrounding said filter element inspaced relation thereto,

said helical magnetized wire element being magnetized in alternatingnorth and south poles along its length.

1. A filter comprising a housing, a filter element in said housing, saidhousing having an inlet extending to one side of said filter element andan outlet extending to the other side of said filter element, means onsaid housing closing one end of said filter element, and a movablebypass valve closing the other end of said filter element, meanscommunicating between the inlet side of said housing and said valve tocause movement of said valve when the pressure exceeds a predeterminedvalue, and a magnetized wire element surrounding said filter element inspaced relation thereto, said wire element comprising a helical coilspring, said helical coil spring being magnetized in alternating northand south poles along its length, said filter including a spring urgingsaid bypass valve to a closed position, said last-mentioned spring beingmagnetized in alternating north and south poles along its length.
 2. Afilter comprising a housing, a filter element in said housing, saidhousing having an inlet extending to one side of said filter element andan outlet extending to the other side of said filter element, means onsaid housing closing one end of said filter element, and bypass valvemeans closing the other end of said filter element, means communicatingbetween the inlet side of said housing and said valve means to causerelative movement of said valve and said filter when the pressureexceeds a predetermined value, and a sinuous magnetized wire elementinterposed between opposed portions of said housing and surrounding saidfilter element in spaced relation thereto, said sinuous magnetized wireelement being magnetized in alternating north and south poles along itslength.
 3. The combination set forth in claim 2 wherein said wireelement comprises a helical coil spring.
 4. The combination set forth inclaim 2 wherein said filter includes a spring urging said bypass valvemeans to a closed position, said last-mentioned spring being magnetizedin alternating north and south poles along its length.
 5. Thecombination set forth in claim 2 wherein said magnetizing wire elementcomprises a strongly magnetic material.
 6. The combination set forth inclaim 5 wherein said material comprises Cunife I.
 7. The combination setforth in claim 2 wherein said magnetized wire element comprises a wireelement including generally vertical legs connected by loops in agenerally cylindrical configuration.
 8. A filter comprising a housing, afilter element in said housing, said housing having an inlet extendingto one side of said filter element and an outlet extending to the otherside of said filter element, means on said housing closing one end ofsaid filter element, and bypass valve means closing the other end ofsaid filter element, means communicating between the inlet side of saidhousing and said valve means to cause relative movement of said valveand said filter when the pressure exceeds a predetermined value, and ahelical magnetized wire element surrounding said filter element inspaced relation thereto, said helical magnetized wire element beingmagnetized in alternating north and south poles along its length.